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A generator connected to an metropolitan system through high voltage line

Electrical Engineering

A generator connected to an metropolitan system through high voltage line. The impedance and reactance are indicated in per unit. The generator is delivering 1.0 p.u power. Breakers are adjacent to fault on both the sides. The inertia constant H = 4.0, the generator terminal voltage is 0.98 p.u. Calculate the maximum and minimum reactive power limits. Determine the load flow equation. Determine X to R ratio and the load bus voltage. Also calculate the short circuit of the system. Calculate the new ON and OFF time of the breaker. Calculate the additional reactive power capability at full load ?

 A 20 KVA, 2200/400 V, three-phase transformer has the followings parameters: H.V(r1 = 8 Ω, x1 = 17Ω) and L.V (r2 = 0.2Ω, x2 = 0.7Ω). Find the full load voltage regulation at 0.8 p.f lag, if the primary voltage is 6600 V. If the transformer delivers 10 Kw at 200 V at pf 0.8 lagging on its l.v. side, determine the input power and power factor. Compute the hysteresis and eddy current losses at 50 Hz. Assume Steinmetz's constant equal to 1.6. Also calculate is assumed to remain the same in both the cases?

A 3-phase induction machine is connected to an infinite bus through a double circuit line. Suppose a three phase fault takes place at the mid point of one feeder. Three circuit breakers are connected across all the three terminals. Cascaded sets of alternators are connected through the feeder. The reactance of the alternator and the tie line are 1.1 p.u and 0.4 p.u.

Determine the center and radius for the pull out curve. Determine the inertia constant of the equivalent machine. Plot the swing curve both for the sustained fault condition and when fault is cleared. Determine the allowable sudden load that can be switched on without loss of stability.

Three electrical machines are connected parallarly in synchronism with each other, one is unbalanced star-delta tranformer, one is 3 phase salient pole induction motor and the last one is single pole alternator. They all are connected in ring main system network. The impedance characteristic of whole system is constant. How to find the motors ratings for variable load drives. In the whole system which shaft will be the first one to fail due to fatiguness if the synchronism will be lost. Explain the desired properties for the shaft for the whole system. What is the role of the armature flux of the armature teeth in the whole system. Design the complete commutator segment for the complete system. How many number of parallel paths are possible in the whole system.

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